Dental tool



"May 7,1946. 0. SELTZAER 2,399,834- I DENTAL! TOOL Filed Dec. 15, 1944 VENTOR 2/: flaw/as 3 e/fzer B 441m ATTORNEYS Patented May 7, 1946 U rso STATES PATENT OFFICE DENTAL TOOL Charles Seltzer, Providence, 1.

Application December is, 1944, Serial 'Ne. 561.905 2 Claims. (or. 32-40) This invention relates to a dental tool partlcu- Fig. 4, I provide a pair of members designated l larly for the preparation of amalgam fillings for and H. The member I0 is generally cylindrical teeth. on its outer surface as at l2 and is provided with Amalgam fillings for teeth are usually provided a recess l3 for holding filling amalgam M which by mixing mercury with silver in a small cup 5 is a mixture of silver and mercury. The shape of with the use of a pestle for the expressing of the the outer surface I2 is, of course, unimportant so mercury from the silver so that the filling will not long as sufficient strength is provided. Openings be too soft. This operation is rather slow and I5 extend through the side wall of the member laborious. Various elaborate affairs have been l0 and ope extend through e bottom provided in an attempt to overcome such simple in wall thereof. A threaded stud I1 is provided exhand methods. tending from the bottom wall iii of the member. One of the objects of this invention is to pro- The member H is solid and has a bulbous survide a simple tool by which mercury may be exface 19 which is of a shape substantially the shape pressed from the silver quickly to provide the deof the surface l3 of the recess in the member '0 sired consistency of the mixture. which receives the filling. This member is solid Another object of this invention is to provide a and rigid and is provided with a similar stud '20 simple hand tool the parts of which may be interwhich extends from its fiat surface 2|. changed that the desired size filling retainer may some means are p d r mount n these be had or that the parts may be readily cleaned. members so that the member I I may press upon Another object of this invention is to provide 20 e fi n mate al M in the recess l3 so as to a rigid means whereby the hand pressure may be supply Sufiicieht p s to c use such free mertransmitted full and with increased leverage for cury as there is present in the amalgam filling to expressing mercury from the amalgam filling. be ed ro t e Openin s l5 and H5 in With these and other objects in View, the inthe forms of ps 2 s h w in Fi s. 5- ne vention consists of certain novel features of consuch means is a pair of plier-like members, desstruction, as will be more fully described and pari nated generally 23 and 24, whi r pivoted ticularly pointed out in the appended claims. s at 5 with handle members 26 and 21 and In the accompanying drawing: per ting jaws 28 and 29. Each of these j ws Fig. l is an elevation illustrating the tool in 28 and 29 have threaded openi r the pclosed position; 30 tion of the studs ll and 20 of the members [0 Fig. 2 is similar to Fig. l with the tool in open nd H. Thus, these members m y be screwed position; into the jaws 28 and 29 so as to be removably Fig. 3 is a view taken substantially on line 3-3 positioned thereon. This enables the members of Fig. 2; to be removed for cleaning which isv at times de- Fig. 4 is a sectional view of the retaining memsirable or members of a different size may be her for the filling, illustrating filling as placed Substltulied in the l therein; The filling material I4 is positioned in the re- Fig. 5 is a view similar to Fig. 4 but showing the eptacle or recess l3 of the member l0 and the second member as in engagement with the filling member H s then moved into member In y and causing an expressing or exuding of mercury means of pressure being applied upon the handle through openings in the cup-shape retaining members 26 and 21 so that such free mercury member. as there is present in the amalgam filling causing In proceeding with this invention I provide a too soft a filling, when first made up, will be exreceptacle member for retaining the filling with pressed or extruded through t p s l5 and small openings extending from the reces i th I6 which are of a size sufilciently small so that receptacle which retains the filling. A second the amalgam filling w l not p therethrough member is provided to engage this member and but which will permit of the free mercury in apply pressure thereto so that the free uncomliquid form to be passed hrough these op gs. b'ined mercury which is present in the filling and The size of these openings are appr y which causes the same to be soft will he exuded 0 fifty-five thousandths of an inch. through the opening in the receptacle member so By this arrangement a very ri n ss on as to form the desired consistency of amalgam of manual pressure is had from the handles to filling for use in filling the teeth of the human the filling material and extrusion through the ody. openings takes place quickly to provide the de- With reference to the drawing, particularly sired consistency of the filling.

In the use of the dental tool a piece of cheeseing a pair of opposing jaws movable toward and cloth may be placed so as to line the inside of the from each other, a receptacle member detachfrom the filling material the same may be reof the recess, a rigid member detachably secured moved by lifting the cloth from the receptacle to the other of said Jaws and provided with a and 1s ieady for use without any further manipuhemispherical convex surface to enter said recess latien by the operator, In this manner the:fill 10 and express mercury through said openings in mg material does not come into contact with the the preparation. of amalgam.

hands. The use of a cloth lining will prevent 2. A dental tool as set forth in claim 1 wherein the material of the filling from clogging the open.- I each member is provided with a threaded stud ings in the receptacle. and each jaw is provided with a threaded recess I claim: 15 to receive said stud for providing the detachable 1. A dental tool for the preparation oi amalconnection between said Jaw and memb r. gam comprising a p er-like instrument provid CHARLES SELTZER. 

